Intensity-dependent photoelectron spectroscopy of gas-phase nanoparticles without focal volume averaging

Powell, Jeffrey; Robatjazi, Seyyed Javad; Vajdu, A.; Makhija, Varun; Stierle, Johannes; Li, X.; Malakar, Y.; Pearson, W. L.; Sorensen, C. M.; Kling, Matthias F.; Rudenko, Artem

doi:10.1364/cleo_qels.2016.fth4m.3

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…The number of ejected electrons has been shown to be strongly dependent on the peak intensity of the laser pulse impingent on the NP [20]. Further, because the NP is several orders of magnitude smaller than the focal spot size and thus the local peak intensity will vary with position of the NP within the focal region [21]. This means that the integrated CEM signals that are measured here (now referred to as simply the CEM signal) will constitute a continuous spectrum meaning that the distinction between the presence and absence of a NP in the focal region is non-trivial.…”

Section: Resultsmentioning

confidence: 99%

Characterization of an aerosolized nanoparticle beam beyond the diffraction limit through strong field ionization

Davino¹,

Saule²,

Helming³

et al. 2022

Preprint

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The study of nanomaterials is an active area of research for technological applications as well as fundamental science. A common method for studying properties of isolated nanoparticles is by an in-vacuum particle beam produced via an aerodynamic lens. Despite being common practice, characterization of such beams has proven difficult as light scattering detection techniques fail for particles with sizes beyond the diffraction limit. Here we present a new technique for characterizing such nanoparticle beams using strong field ionization. By focusing an ultrafast, mJ-level laser into the particle beam, a nanoparticle within the laser focus is ionized and easily detected by its ejected electrons. This method gives direct access to the nanoparticle density at the location of the focus and, by scanning the focus through the transverse and longitudinal profiles of the particle beam, the 3-dimensional particle density distribution can be attained. Further, we show that strong field ionization is effective in detecting spherical nanoparticles as small as 10 nm in diameter. Additionally, this technique is an effective tool in optimizing the particle beam for specific applications. As an example we show that the particle beam density and width can be manipulated by restricting the gas flow into the aerodynamic lens.

show abstract

Section: Resultsmentioning

confidence: 99%

Characterization of an aerosolized nanoparticle beam beyond the diffraction limit through strong field ionization

Davino¹,

Saule²,

Helming³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

Characterization of an aerosolized nanoparticle beam beyond the diffraction limit through strong field ionization

Davino

Saule

Helming

et al. 2022

Sci Rep

View full text Add to dashboard Cite

The study of nanomaterials is an active area of research for technological applications as well as fundamental science. A common method for studying properties of isolated nanoparticles is by an in-vacuum particle beam produced via an aerodynamic lens. Despite being common practice, characterization of such beams has proven difficult as light scattering detection techniques fail for particles with sizes beyond the diffraction limit. Here we present a new technique for characterizing such nanoparticle beams using strong field ionization. By focusing an ultrafast, mJ-level laser into the particle beam, a nanoparticle within the laser focus is ionized and easily detected by its ejected electrons. This method grants direct access to the nanoparticle density at the location of the focus, and by scanning the focus through the transverse and longitudinal profiles of the particle beam we attain the 3-dimensional particle density distribution for a cylindrically symmetric beam. Further, we show that strong field ionization is effective in detecting spherical nanoparticles as small as 10 nm in diameter. Additionally, this technique is an effective tool in optimizing the particle beam for specific applications. As an example we show that the particle beam density and width can be manipulated by restricting the gas flow into the aerodynamic lens.

show abstract

Intensity-dependent photoelectron spectroscopy of gas-phase nanoparticles without focal volume averaging

Cited by 2 publications

References 5 publications

Characterization of an aerosolized nanoparticle beam beyond the diffraction limit through strong field ionization

Characterization of an aerosolized nanoparticle beam beyond the diffraction limit through strong field ionization

Characterization of an aerosolized nanoparticle beam beyond the diffraction limit through strong field ionization

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